NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 8,036 terms related to cancer and medicine.

The CIS is the National Cancer Institute's link to the public, interpreting and explaining research findings in a clear and understandable manner, and providing personalized responses to specific questions about cancer. Access the CIS by calling 1-800-4-CANCER (1-800-422-6237), or by using the LiveHelp instant-messaging service at Also called Cancer Information Service.